diff options
| author | Ghanan Gowripalan <ghanan@google.com> | 2020-10-09 12:07:02 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-10-09 12:09:12 -0700 |
| commit | 257703c050e5901aeb3734f200f5a6b41856b4d9 (patch) | |
| tree | 6456ba92143cbbd7f2dd1eec4edeed122273da15 /pkg/sentry/devices/tundev | |
| parent | 33d6622172a85209f644840409d1b00ae94d609c (diff) | |
Automated rollback of changelist 336304024
PiperOrigin-RevId: 336339194
Diffstat (limited to 'pkg/sentry/devices/tundev')
| -rw-r--r-- | pkg/sentry/devices/tundev/BUILD | 1 | ||||
| -rw-r--r-- | pkg/sentry/devices/tundev/tundev.go | 14 |
2 files changed, 14 insertions, 1 deletions
diff --git a/pkg/sentry/devices/tundev/BUILD b/pkg/sentry/devices/tundev/BUILD index 71c59287c..14a8bf9cd 100644 --- a/pkg/sentry/devices/tundev/BUILD +++ b/pkg/sentry/devices/tundev/BUILD @@ -17,6 +17,7 @@ go_library( "//pkg/sentry/vfs", "//pkg/syserror", "//pkg/tcpip/link/tun", + "//pkg/tcpip/network/arp", "//pkg/usermem", "//pkg/waiter", ], diff --git a/pkg/sentry/devices/tundev/tundev.go b/pkg/sentry/devices/tundev/tundev.go index 0b701a289..655ea549b 100644 --- a/pkg/sentry/devices/tundev/tundev.go +++ b/pkg/sentry/devices/tundev/tundev.go @@ -16,6 +16,8 @@ package tundev import ( + "fmt" + "gvisor.dev/gvisor/pkg/abi/linux" "gvisor.dev/gvisor/pkg/context" "gvisor.dev/gvisor/pkg/sentry/arch" @@ -26,6 +28,7 @@ import ( "gvisor.dev/gvisor/pkg/sentry/vfs" "gvisor.dev/gvisor/pkg/syserror" "gvisor.dev/gvisor/pkg/tcpip/link/tun" + "gvisor.dev/gvisor/pkg/tcpip/network/arp" "gvisor.dev/gvisor/pkg/usermem" "gvisor.dev/gvisor/pkg/waiter" ) @@ -84,7 +87,16 @@ func (fd *tunFD) Ioctl(ctx context.Context, uio usermem.IO, args arch.SyscallArg return 0, err } flags := usermem.ByteOrder.Uint16(req.Data[:]) - return 0, fd.device.SetIff(stack.Stack, req.Name(), flags) + created, err := fd.device.SetIff(stack.Stack, req.Name(), flags) + if err == nil && created { + // Always start with an ARP address for interfaces so they can handle ARP + // packets. + nicID := fd.device.NICID() + if err := stack.Stack.AddAddress(nicID, arp.ProtocolNumber, arp.ProtocolAddress); err != nil { + panic(fmt.Sprintf("failed to add ARP address after creating new TUN/TAP interface with ID = %d", nicID)) + } + } + return 0, err case linux.TUNGETIFF: var req linux.IFReq |